A method and power transmitter for efficiently controlling power transmission to one or more power receivers in a wireless multi-power transmission system are provided. The method includes performing, when a predetermined measurement cycle arrives, a load measurement; comparing a current load measurement value with a previous load measurement value; determining whether the current load measurement value is increased over the previous load measurement value by at least as much as a first predetermined threshold; gradually increasing, when the load measurement value is increased over the previous load measurement value by at least as much as the first threshold, a transmission power value until a request for a subscription to a wireless multi-power transmission network from a power reception target within a predetermined time limit; and stopping, when the request for the subscription is not received before the time limit is exceeded, power transmission to the power reception target.
Legal claims defining the scope of protection, as filed with the USPTO.
1. A method of wirelessly transmitting power by a wireless power transmitter, the method comprising: periodically outputting, through a resonator of the wireless power transmitter, first power for detecting a change of a load; in response to the change of the load being detected, outputting, through the resonator, second power for communicating with a wireless power receiver; in response to a first signal being not received for a period, changing a power level of the second power from a first level to a second level while outputting the second power; receiving the first signal from the wireless power receiver while outputting the second power with the second level, wherein the first signal includes information regarding a reference load; based on the information regarding the reference load, transmitting a second signal to the wireless power receiver; and outputting, through the resonator, third power to the wireless power receiver for charging the wireless power receiver.
2. The method as claimed in claim 1 , further comprising: stopping output of the second power to the wireless power receiver in response to the first signal not being received within a predetermined time.
3. The method as claimed in claim 1 , further comprising: identifying whether the wireless power receiver is capable of joining a wireless transmission network based on the information included in the first signal; and allowing the wireless power receiver to join the wireless transmission network in response to the wireless power receiver being identified to be capable of joining the wireless transmission network.
4. The method as claimed in claim 3 , further comprising: denying registration of the wireless power receiver to the wireless transmission network in response to the wireless power receiver being identified not to be capable of joining the wireless transmission network.
5. The method as claimed in claim 4 , further comprising: stopping output of the second power to the wireless power receiver in response to the wireless power receiver being denied.
6. The method as claimed in claim 1 , wherein the first signal includes an ID information of the wireless power receiver.
7. The method as claimed in claim 1 , further comprising: comparing a measurement value corresponding to the change of the load with the reference load; and detecting the change of the load in response to a difference between the measurement value and the reference load being within an acceptable range.
8. A wireless power transmitter for wirelessly transmitting power, the wireless power transmitter comprising: a resonator; communication circuitry; and a processor configured to: periodically control to output, through the resonator, first power for detecting a change of a load; control to, in response to the change of the load being detected, output, through the resonator, second power for communicating with a wireless power receiver; in response to a first signal being not received for a period, control to change a power level of the second power from a first level to a second level while outputting the second power; control to receive the first signal from the wireless power receiver via the communication circuitry while outputting the second power with the second level, wherein the first signal includes information regarding a reference load; based on the information regarding the reference load, control to transmit a second signal to the wireless power receiver via the communication circuitry; and control to output, through the resonator, third power to the wireless power receiver for charging the wireless power receiver.
9. The wireless power transmitter claimed in claim 8 , wherein the processor controls to stop output of the second power to the wireless power receiver in response to the first signal not being received within a predetermined time.
10. The wireless power transmitter claimed in claim 8 , wherein the processor identifies whether the wireless power receiver is capable of joining a wireless transmission network based on the information included in the first signal and allows the wireless power receiver to join the wireless transmission network in response to the wireless power receiver being identified to be capable of joining the wireless transmission network.
11. The wireless power transmitter claimed in claim 10 , wherein the processor denies registration of the wireless power receiver to the wireless transmission network in response to the wireless power receiver being identified not to be capable of joining the wireless transmission network.
12. The wireless power transmitter claimed in claim 11 , wherein the processor controls to stop output of the second power in response to the wireless power receiver being denied.
13. The wireless power transmitter claimed in claim 8 , wherein the first signal includes an ID information of the wireless power receiver.
14. The wireless power transmitter claimed in claim 8 , wherein the processor compares a measurement value corresponding to the change of the load with the reference load and detects the change of the load in response to a difference between the measurement value and the reference load being within an acceptable range.
Cooperative Patent Classification codes for this invention. Click any code to explore related patents in that topic.
April 27, 2020
December 7, 2021
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